參數(shù)資料
型號(hào): ARM60
廠商: Mitel Networks Corporation
英文描述: Low Power General Purpose 32-Bit RISC Microprocessor(低功耗通用32位精簡指令集微處理器)
中文描述: 低功耗通用32位RISC微處理器(低功耗通用32位精簡指令集微處理器)
文件頁數(shù): 40/121頁
文件大小: 1217K
代理商: ARM60
P60ARM-B
36
4.7 Single data transfer (LDR, STR)
The instruction is only executed if the condition is true. The various conditions are defined at the beginning
of this chapter. The instruction encoding is shown in
Figure 17: Single Data Transfer Instructions
.
The single data transfer instructions are used to load or store single bytes or words of data. The memory
address used in the transfer is calculated by adding an offset to or subtracting an offset from a base register.
The result of this calculation may be written back into the base register if `auto-indexing' is required.
Figure 17: Single Data Transfer Instructions
Cond
I
Rn
Rd
0
11
12
15
16
19
20
21
24
25
26
27
28
31
01
P U B W L
Offset
22
23
0
11
Source/Destination register
Base register
Load/Store bit
0 = Store to memory
1 = Load from memory
Write-back bit
0 = no write-back
1 = write address into base
Byte/Word bit
0 = transfer word quantity
1 = transfer byte quantity
Up/Down bit
1 = up; add offset to base
Pre/Post indexing bit
0 = post; add offset after transfer
1 = pre; add offset before transfer
Immediate offset
Immediate offset
Unsigned 12 bit immediate offset
1 = offset is a register
11
0
shift applied to Rm
3
4
Condition field
Offset register
Shift
Rm
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